99.6% is the method-effectiveness (i.e. the efficacy if used properly) or 0.4 unintended pregnancies per 100 "women years" (13 cycles)
Other interesting results from the study:
- the method-effectiveness rate found for this method is comparable to oral contraceptive
- 9.2% stopped using the method due to dissatisfaction
- Couples that had intercourse during the fertile period had an increased pregnancy rate of 7.5%
- This study was done in European countries and the pregnancy rate was lower than similar studies performed in developing countries
99.6% is the method-effectiveness (i.e. the efficacy if used properly) or 0.4 unintended pregnancies per 100 "women years" (13 cycles)
Other interesting results from the study: - the method-effectiveness rate found for this method is comparable to oral contraceptive - 9.2% stopped using the method due to dissatisfaction - Couples that had intercourse during the fertile period had an increased pregnancy rate of 7.5% - This study was done in European countries and the pregnancy rate was lower than similar studies performed in developing countries